Semi-quantitative Visual Grading of Myocardial 99mTechnetium-Pyrophosphate Uptake Relative to Rib
| Grade 0 | No myocardial uptake and normal bone uptake |
| Grade 1 | Myocardial uptake less than rib uptake |
| Grade 2 | Myocardial uptake equal to rib uptake |
| Grade 3 | Myocardial uptake greater than rib uptake with mild/absent rib uptake |